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1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
4 | * | |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <asm/semaphore.h> | |
16 | ||
17 | #include "gfs2.h" | |
18 | #include "bmap.h" | |
19 | #include "glock.h" | |
20 | #include "glops.h" | |
21 | #include "inode.h" | |
22 | #include "log.h" | |
23 | #include "meta_io.h" | |
24 | #include "page.h" | |
25 | #include "recovery.h" | |
26 | #include "rgrp.h" | |
27 | ||
28 | /** | |
29 | * meta_go_sync - sync out the metadata for this glock | |
30 | * @gl: the glock | |
31 | * @flags: DIO_* | |
32 | * | |
33 | * Called when demoting or unlocking an EX glock. We must flush | |
34 | * to disk all dirty buffers/pages relating to this glock, and must not | |
35 | * not return to caller to demote/unlock the glock until I/O is complete. | |
36 | */ | |
37 | ||
38 | static void meta_go_sync(struct gfs2_glock *gl, int flags) | |
39 | { | |
40 | if (!(flags & DIO_METADATA)) | |
41 | return; | |
42 | ||
43 | if (test_and_clear_bit(GLF_DIRTY, &gl->gl_flags)) { | |
44 | gfs2_log_flush_glock(gl); | |
45 | gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT); | |
46 | if (flags & DIO_RELEASE) | |
47 | gfs2_ail_empty_gl(gl); | |
48 | } | |
49 | ||
50 | clear_bit(GLF_SYNC, &gl->gl_flags); | |
51 | } | |
52 | ||
53 | /** | |
54 | * meta_go_inval - invalidate the metadata for this glock | |
55 | * @gl: the glock | |
56 | * @flags: | |
57 | * | |
58 | */ | |
59 | ||
60 | static void meta_go_inval(struct gfs2_glock *gl, int flags) | |
61 | { | |
62 | if (!(flags & DIO_METADATA)) | |
63 | return; | |
64 | ||
65 | gfs2_meta_inval(gl); | |
66 | gl->gl_vn++; | |
67 | } | |
68 | ||
69 | /** | |
70 | * meta_go_demote_ok - Check to see if it's ok to unlock a glock | |
71 | * @gl: the glock | |
72 | * | |
73 | * Returns: 1 if we have no cached data; ok to demote meta glock | |
74 | */ | |
75 | ||
76 | static int meta_go_demote_ok(struct gfs2_glock *gl) | |
77 | { | |
78 | return !gl->gl_aspace->i_mapping->nrpages; | |
79 | } | |
80 | ||
81 | /** | |
82 | * inode_go_xmote_th - promote/demote a glock | |
83 | * @gl: the glock | |
84 | * @state: the requested state | |
85 | * @flags: | |
86 | * | |
87 | */ | |
88 | ||
89 | static void inode_go_xmote_th(struct gfs2_glock *gl, unsigned int state, | |
90 | int flags) | |
91 | { | |
92 | if (gl->gl_state != LM_ST_UNLOCKED) | |
93 | gfs2_pte_inval(gl); | |
94 | gfs2_glock_xmote_th(gl, state, flags); | |
95 | } | |
96 | ||
97 | /** | |
98 | * inode_go_xmote_bh - After promoting/demoting a glock | |
99 | * @gl: the glock | |
100 | * | |
101 | */ | |
102 | ||
103 | static void inode_go_xmote_bh(struct gfs2_glock *gl) | |
104 | { | |
105 | struct gfs2_holder *gh = gl->gl_req_gh; | |
106 | struct buffer_head *bh; | |
107 | int error; | |
108 | ||
109 | if (gl->gl_state != LM_ST_UNLOCKED && | |
110 | (!gh || !(gh->gh_flags & GL_SKIP))) { | |
111 | error = gfs2_meta_read(gl, gl->gl_name.ln_number, DIO_START, | |
112 | &bh); | |
113 | if (!error) | |
114 | brelse(bh); | |
115 | } | |
116 | } | |
117 | ||
118 | /** | |
119 | * inode_go_drop_th - unlock a glock | |
120 | * @gl: the glock | |
121 | * | |
122 | * Invoked from rq_demote(). | |
123 | * Another node needs the lock in EXCLUSIVE mode, or lock (unused for too long) | |
124 | * is being purged from our node's glock cache; we're dropping lock. | |
125 | */ | |
126 | ||
127 | static void inode_go_drop_th(struct gfs2_glock *gl) | |
128 | { | |
129 | gfs2_pte_inval(gl); | |
130 | gfs2_glock_drop_th(gl); | |
131 | } | |
132 | ||
133 | /** | |
134 | * inode_go_sync - Sync the dirty data and/or metadata for an inode glock | |
135 | * @gl: the glock protecting the inode | |
136 | * @flags: | |
137 | * | |
138 | */ | |
139 | ||
140 | static void inode_go_sync(struct gfs2_glock *gl, int flags) | |
141 | { | |
142 | int meta = (flags & DIO_METADATA); | |
143 | int data = (flags & DIO_DATA); | |
144 | ||
145 | if (test_bit(GLF_DIRTY, &gl->gl_flags)) { | |
146 | if (meta && data) { | |
147 | gfs2_page_sync(gl, flags | DIO_START); | |
148 | gfs2_log_flush_glock(gl); | |
149 | gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT); | |
150 | gfs2_page_sync(gl, flags | DIO_WAIT); | |
151 | clear_bit(GLF_DIRTY, &gl->gl_flags); | |
152 | } else if (meta) { | |
153 | gfs2_log_flush_glock(gl); | |
154 | gfs2_meta_sync(gl, flags | DIO_START | DIO_WAIT); | |
155 | } else if (data) | |
156 | gfs2_page_sync(gl, flags | DIO_START | DIO_WAIT); | |
157 | if (flags & DIO_RELEASE) | |
158 | gfs2_ail_empty_gl(gl); | |
159 | } | |
160 | ||
161 | clear_bit(GLF_SYNC, &gl->gl_flags); | |
162 | } | |
163 | ||
164 | /** | |
165 | * inode_go_inval - prepare a inode glock to be released | |
166 | * @gl: the glock | |
167 | * @flags: | |
168 | * | |
169 | */ | |
170 | ||
171 | static void inode_go_inval(struct gfs2_glock *gl, int flags) | |
172 | { | |
173 | int meta = (flags & DIO_METADATA); | |
174 | int data = (flags & DIO_DATA); | |
175 | ||
176 | if (meta) { | |
177 | gfs2_meta_inval(gl); | |
178 | gl->gl_vn++; | |
179 | } | |
180 | if (data) | |
181 | gfs2_page_inval(gl); | |
182 | } | |
183 | ||
184 | /** | |
185 | * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock | |
186 | * @gl: the glock | |
187 | * | |
188 | * Returns: 1 if it's ok | |
189 | */ | |
190 | ||
191 | static int inode_go_demote_ok(struct gfs2_glock *gl) | |
192 | { | |
193 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
194 | int demote = 0; | |
195 | ||
196 | if (!get_gl2ip(gl) && !gl->gl_aspace->i_mapping->nrpages) | |
197 | demote = 1; | |
198 | else if (!sdp->sd_args.ar_localcaching && | |
199 | time_after_eq(jiffies, gl->gl_stamp + | |
200 | gfs2_tune_get(sdp, gt_demote_secs) * HZ)) | |
201 | demote = 1; | |
202 | ||
203 | return demote; | |
204 | } | |
205 | ||
206 | /** | |
207 | * inode_go_lock - operation done after an inode lock is locked by a process | |
208 | * @gl: the glock | |
209 | * @flags: | |
210 | * | |
211 | * Returns: errno | |
212 | */ | |
213 | ||
214 | static int inode_go_lock(struct gfs2_holder *gh) | |
215 | { | |
216 | struct gfs2_glock *gl = gh->gh_gl; | |
217 | struct gfs2_inode *ip = get_gl2ip(gl); | |
218 | int error = 0; | |
219 | ||
220 | if (!ip) | |
221 | return 0; | |
222 | ||
223 | if (ip->i_vn != gl->gl_vn) { | |
224 | error = gfs2_inode_refresh(ip); | |
225 | if (error) | |
226 | return error; | |
227 | gfs2_inode_attr_in(ip); | |
228 | } | |
229 | ||
230 | if ((ip->i_di.di_flags & GFS2_DIF_TRUNC_IN_PROG) && | |
231 | (gl->gl_state == LM_ST_EXCLUSIVE) && | |
232 | (gh->gh_flags & GL_LOCAL_EXCL)) | |
233 | error = gfs2_truncatei_resume(ip); | |
234 | ||
235 | return error; | |
236 | } | |
237 | ||
238 | /** | |
239 | * inode_go_unlock - operation done before an inode lock is unlocked by a | |
240 | * process | |
241 | * @gl: the glock | |
242 | * @flags: | |
243 | * | |
244 | */ | |
245 | ||
246 | static void inode_go_unlock(struct gfs2_holder *gh) | |
247 | { | |
248 | struct gfs2_glock *gl = gh->gh_gl; | |
249 | struct gfs2_inode *ip = get_gl2ip(gl); | |
250 | ||
251 | if (ip && test_bit(GLF_DIRTY, &gl->gl_flags)) | |
252 | gfs2_inode_attr_in(ip); | |
253 | ||
254 | if (ip) | |
255 | gfs2_meta_cache_flush(ip); | |
256 | } | |
257 | ||
258 | /** | |
259 | * inode_greedy - | |
260 | * @gl: the glock | |
261 | * | |
262 | */ | |
263 | ||
264 | static void inode_greedy(struct gfs2_glock *gl) | |
265 | { | |
266 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
267 | struct gfs2_inode *ip = get_gl2ip(gl); | |
268 | unsigned int quantum = gfs2_tune_get(sdp, gt_greedy_quantum); | |
269 | unsigned int max = gfs2_tune_get(sdp, gt_greedy_max); | |
270 | unsigned int new_time; | |
271 | ||
272 | spin_lock(&ip->i_spin); | |
273 | ||
274 | if (time_after(ip->i_last_pfault + quantum, jiffies)) { | |
275 | new_time = ip->i_greedy + quantum; | |
276 | if (new_time > max) | |
277 | new_time = max; | |
278 | } else { | |
279 | new_time = ip->i_greedy - quantum; | |
280 | if (!new_time || new_time > max) | |
281 | new_time = 1; | |
282 | } | |
283 | ||
284 | ip->i_greedy = new_time; | |
285 | ||
286 | spin_unlock(&ip->i_spin); | |
287 | ||
288 | gfs2_inode_put(ip); | |
289 | } | |
290 | ||
291 | /** | |
292 | * rgrp_go_demote_ok - Check to see if it's ok to unlock a RG's glock | |
293 | * @gl: the glock | |
294 | * | |
295 | * Returns: 1 if it's ok | |
296 | */ | |
297 | ||
298 | static int rgrp_go_demote_ok(struct gfs2_glock *gl) | |
299 | { | |
300 | return !gl->gl_aspace->i_mapping->nrpages; | |
301 | } | |
302 | ||
303 | /** | |
304 | * rgrp_go_lock - operation done after an rgrp lock is locked by | |
305 | * a first holder on this node. | |
306 | * @gl: the glock | |
307 | * @flags: | |
308 | * | |
309 | * Returns: errno | |
310 | */ | |
311 | ||
312 | static int rgrp_go_lock(struct gfs2_holder *gh) | |
313 | { | |
314 | return gfs2_rgrp_bh_get(get_gl2rgd(gh->gh_gl)); | |
315 | } | |
316 | ||
317 | /** | |
318 | * rgrp_go_unlock - operation done before an rgrp lock is unlocked by | |
319 | * a last holder on this node. | |
320 | * @gl: the glock | |
321 | * @flags: | |
322 | * | |
323 | */ | |
324 | ||
325 | static void rgrp_go_unlock(struct gfs2_holder *gh) | |
326 | { | |
327 | gfs2_rgrp_bh_put(get_gl2rgd(gh->gh_gl)); | |
328 | } | |
329 | ||
330 | /** | |
331 | * trans_go_xmote_th - promote/demote the transaction glock | |
332 | * @gl: the glock | |
333 | * @state: the requested state | |
334 | * @flags: | |
335 | * | |
336 | */ | |
337 | ||
338 | static void trans_go_xmote_th(struct gfs2_glock *gl, unsigned int state, | |
339 | int flags) | |
340 | { | |
341 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
342 | ||
343 | if (gl->gl_state != LM_ST_UNLOCKED && | |
344 | test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { | |
345 | gfs2_meta_syncfs(sdp); | |
346 | gfs2_log_shutdown(sdp); | |
347 | } | |
348 | ||
349 | gfs2_glock_xmote_th(gl, state, flags); | |
350 | } | |
351 | ||
352 | /** | |
353 | * trans_go_xmote_bh - After promoting/demoting the transaction glock | |
354 | * @gl: the glock | |
355 | * | |
356 | */ | |
357 | ||
358 | static void trans_go_xmote_bh(struct gfs2_glock *gl) | |
359 | { | |
360 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
361 | struct gfs2_glock *j_gl = sdp->sd_jdesc->jd_inode->i_gl; | |
362 | struct gfs2_log_header head; | |
363 | int error; | |
364 | ||
365 | if (gl->gl_state != LM_ST_UNLOCKED && | |
366 | test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { | |
367 | gfs2_meta_cache_flush(sdp->sd_jdesc->jd_inode); | |
368 | j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA); | |
369 | ||
370 | error = gfs2_find_jhead(sdp->sd_jdesc, &head); | |
371 | if (error) | |
372 | gfs2_consist(sdp); | |
373 | if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) | |
374 | gfs2_consist(sdp); | |
375 | ||
376 | /* Initialize some head of the log stuff */ | |
377 | if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) { | |
378 | sdp->sd_log_sequence = head.lh_sequence + 1; | |
379 | gfs2_log_pointers_init(sdp, head.lh_blkno); | |
380 | } | |
381 | } | |
382 | } | |
383 | ||
384 | /** | |
385 | * trans_go_drop_th - unlock the transaction glock | |
386 | * @gl: the glock | |
387 | * | |
388 | * We want to sync the device even with localcaching. Remember | |
389 | * that localcaching journal replay only marks buffers dirty. | |
390 | */ | |
391 | ||
392 | static void trans_go_drop_th(struct gfs2_glock *gl) | |
393 | { | |
394 | struct gfs2_sbd *sdp = gl->gl_sbd; | |
395 | ||
396 | if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) { | |
397 | gfs2_meta_syncfs(sdp); | |
398 | gfs2_log_shutdown(sdp); | |
399 | } | |
400 | ||
401 | gfs2_glock_drop_th(gl); | |
402 | } | |
403 | ||
404 | /** | |
405 | * quota_go_demote_ok - Check to see if it's ok to unlock a quota glock | |
406 | * @gl: the glock | |
407 | * | |
408 | * Returns: 1 if it's ok | |
409 | */ | |
410 | ||
411 | static int quota_go_demote_ok(struct gfs2_glock *gl) | |
412 | { | |
413 | return !atomic_read(&gl->gl_lvb_count); | |
414 | } | |
415 | ||
416 | struct gfs2_glock_operations gfs2_meta_glops = { | |
417 | .go_xmote_th = gfs2_glock_xmote_th, | |
418 | .go_drop_th = gfs2_glock_drop_th, | |
419 | .go_sync = meta_go_sync, | |
420 | .go_inval = meta_go_inval, | |
421 | .go_demote_ok = meta_go_demote_ok, | |
422 | .go_type = LM_TYPE_META | |
423 | }; | |
424 | ||
425 | struct gfs2_glock_operations gfs2_inode_glops = { | |
426 | .go_xmote_th = inode_go_xmote_th, | |
427 | .go_xmote_bh = inode_go_xmote_bh, | |
428 | .go_drop_th = inode_go_drop_th, | |
429 | .go_sync = inode_go_sync, | |
430 | .go_inval = inode_go_inval, | |
431 | .go_demote_ok = inode_go_demote_ok, | |
432 | .go_lock = inode_go_lock, | |
433 | .go_unlock = inode_go_unlock, | |
434 | .go_greedy = inode_greedy, | |
435 | .go_type = LM_TYPE_INODE | |
436 | }; | |
437 | ||
438 | struct gfs2_glock_operations gfs2_rgrp_glops = { | |
439 | .go_xmote_th = gfs2_glock_xmote_th, | |
440 | .go_drop_th = gfs2_glock_drop_th, | |
441 | .go_sync = meta_go_sync, | |
442 | .go_inval = meta_go_inval, | |
443 | .go_demote_ok = rgrp_go_demote_ok, | |
444 | .go_lock = rgrp_go_lock, | |
445 | .go_unlock = rgrp_go_unlock, | |
446 | .go_type = LM_TYPE_RGRP | |
447 | }; | |
448 | ||
449 | struct gfs2_glock_operations gfs2_trans_glops = { | |
450 | .go_xmote_th = trans_go_xmote_th, | |
451 | .go_xmote_bh = trans_go_xmote_bh, | |
452 | .go_drop_th = trans_go_drop_th, | |
453 | .go_type = LM_TYPE_NONDISK | |
454 | }; | |
455 | ||
456 | struct gfs2_glock_operations gfs2_iopen_glops = { | |
457 | .go_xmote_th = gfs2_glock_xmote_th, | |
458 | .go_drop_th = gfs2_glock_drop_th, | |
459 | .go_callback = gfs2_iopen_go_callback, | |
460 | .go_type = LM_TYPE_IOPEN | |
461 | }; | |
462 | ||
463 | struct gfs2_glock_operations gfs2_flock_glops = { | |
464 | .go_xmote_th = gfs2_glock_xmote_th, | |
465 | .go_drop_th = gfs2_glock_drop_th, | |
466 | .go_type = LM_TYPE_FLOCK | |
467 | }; | |
468 | ||
469 | struct gfs2_glock_operations gfs2_nondisk_glops = { | |
470 | .go_xmote_th = gfs2_glock_xmote_th, | |
471 | .go_drop_th = gfs2_glock_drop_th, | |
472 | .go_type = LM_TYPE_NONDISK | |
473 | }; | |
474 | ||
475 | struct gfs2_glock_operations gfs2_quota_glops = { | |
476 | .go_xmote_th = gfs2_glock_xmote_th, | |
477 | .go_drop_th = gfs2_glock_drop_th, | |
478 | .go_demote_ok = quota_go_demote_ok, | |
479 | .go_type = LM_TYPE_QUOTA | |
480 | }; | |
481 | ||
482 | struct gfs2_glock_operations gfs2_journal_glops = { | |
483 | .go_xmote_th = gfs2_glock_xmote_th, | |
484 | .go_drop_th = gfs2_glock_drop_th, | |
485 | .go_type = LM_TYPE_JOURNAL | |
486 | }; | |
487 |